Practice IB Design Technology (DT) Topic 4.2d Plastics with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for 4.2d Plastics and mirrors Paper 1, 2, 3 style where relevant.
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A manufacturer is developing a casing for a heavy-duty electrical component. They require a polymer that will not soften or change shape once it has been cured, even if subjected to extreme heat during a circuit failure.
Which characteristic of the polymer's molecular structure provides this specific property?
A technician at a recycling plant is categorising polymer waste based on specific properties and applications. They record the following observations for two samples:
| Sample | Physical Properties | Common Application |
|---|---|---|
| X | Transparent, high pressure resistance | Carbonated soft drink bottles |
| Y | Translucent, high strength-to-density ratio | Milk and detergent containers |
Which Resin Identification Code would typically be found as a symbol on Sample Y to assist in the sorting process?
Which thermoplastic is specifically chosen for the manufacture of 'living hinges' on product packaging because it can be flexed repeatedly without fracturing?
Which of the following plastics is known for its excellent impact resistance and is commonly used in the manufacturing of safety helmets?
(a) Table 1 compares the characteristics of two types of polyethylene used in industrial manufacturing.
| Property | Variation A (HDPE) | Variation B (LDPE) |
|---|---|---|
| Molecular Structure | Linear chains | Highly branched chains |
| Density |
With reference to their molecular structure, why Variation A has a higher density than Variation B.
(b) how the addition of plasticizers modifies the physical properties of Polyvinyl Chloride (PVC) to make it suitable for flexible applications such as medical tubing.
The presence of weak secondary bonds between linear molecules
The formation of extensive covalent cross-links during setting
The use of large side groups to prevent chain sliding
The alignment of molecular chains into highly crystalline regions
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